Remove Duplicate Items from a Generic List

If you have a List<string> and want to remove duplicate values before binding it to a control, here's how to do so


var strList = new List<string> 

{ "Jane", "Bill", "jane", "carol", "Carol", "bill" }; 

strList = strList.ConvertAll(low => low.ToLowerInvariant());


var result = from str in strList

        group str by str into grp

        select new { Text = grp.Key};

foreach (var res in result)





    Dim strList = New List(Of String)(New String() _

                {"Jane", "Bill", "jane", "carol", "Carol", "bill"})

    strList = strList.ConvertAll _

    (Function(low) low.ToLowerInvariant())


    Dim result = _

     From str In strList _

     Group str By str Into grp = Group _

     Select New With {Key .Text = str}

    For Each res In result


    Next res

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About The Author

Suprotim Agarwal
Suprotim Agarwal, ASP.NET Architecture MVP (Microsoft Most Valuable Professional) works as an Architect Consultant and provides consultancy on how to design and develop Web applications.

Suprotim is also the founder and primary contributor to DevCurry, DotNetCurry and SQLServerCurry. He is the Editor of a Developer Magazine called DNC Magazine. He has also written two EBooks 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook

Follow him on twitter @suprotimagarwal

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